What contact cleaner do you recommend?

As far as a cleaner, I use 99% Isopropyl alcohol. I no longer use any metal bearing pastes or liquids, as the carriers in most cases tend to dry out into a gummy mess (especially with heat). I find Caig DeOxit to be moderately useful when cleaning switches and pots (things that move or will be moved) but fairly useless on stable objects like RCA connectors as it tends to adversely affect the sound.

As a contact enhancer, I use Stabilant-22 concentrate mixed with isopropanol as the carrier, which I think is considerably better than Kontak. YMMV and all that.

I found that both Walker and Xtreme degrade significantly over a short time. They do make a very positive initial effect. Personally, I would avoid either.

I do recommend Walker Talisman and Xtreme CD cleaner. Those are great products.

I have had great results using the Caig products about every six months.

Thanx for the suggestions. The Kontak appears to be what i'm looking for. The Stabilant 22 is more lubricant then cleaner. Has anyone used Kontak on tube pins? If so were the results positive?

The one issue for ALL the products is to use a very tiny amount. More is NOT better with a contact enhancer.

So the point is put the fluid on the surface, then wipe the surface off. Not squeeky clean, but pretty dry. One only wants a few molecule thick layer on the stuff on the surface. If you can see or touch it and get some on your finger, you left TOO MUCH on the surface.

That advice applies to all the products. Tweek, Caig, and the silver stuff.